作者:Ursula A. Häusermann、Anthony Linden、Jiangao Song、Manfred Hesse
DOI:10.1002/hlca.19960790721
日期:1996.10.30
An asymmetric synthesis of the spermidine alkaloid (−)-(2R)-dihydromyricoidine (5) was performed by employing two ring-enlargement reactions. The chiral center was introduced by a diastereoselective Michael addition of perhydropyridazine (7) to the α,β-unsaturated ester 6. The (Z)-CC bond was obtained by a selective Wittig reaction. The synthetic compound 5 was found to have a negative value for the
通过使用两个环扩大反应,进行亚精胺生物碱(-)-(2 R)-二氢肉豆蔻碱(5)的不对称合成。手性中心是通过非对映选择性的将过氢哒嗪(7)加到α,β-不饱和酯6上的Michael加成的。通过选择性维蒂希反应获得(Z)-CC键。发现合成化合物5的比旋度为负值。这与文献中报道的天然产物相反。因此,作为该合成的结果,天然生物碱的绝对构型应颠倒为如结构V所示。